Monthly Climate Summary for December 2009 at Whipsnade (Lodge)

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Very unsettled but mild first week;  very cold and wintry second half although cold relaxed after Christmas

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Overall mean temperature was

2.2

ºC

which is

-1.6

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

4.3

ºC

which is

-1.9

degC

compared with the 1971-2000 average

Mean night minimum (21-09) was

0.2

ºC

which is

-1.3

degC

compared with the 1971-2000 average

Mean 24hr maximum (09-09) was

4.6

ºC

Mean 24hr minimum (09-09) was

-0.3

ºC

Highest day max was

9.8

ºC

on  the

5

Lowest day max was

-0.5

ºC

on  the

18

Highest night min was

7.4

ºC

on  the

6

Lowest night min was

-8.9

ºC

on  the

20

Lowest grass min was

-15.4

ºC

on  the

21

Total rainfall this month was

113.7

mm

which is

160.1

per  cent

of the 1971-2000 average

Highest daily fall was

17.6

mm

on  the

29

Number of hours with rain was

TSR rainfall duration was

114.0

hrs

which is

per  cent

of the 1971-2000 average

Highest no of wet hrs

hrs

on  the

Highest duration

15.0

hrs

on  the

Mean rainfall intensity

1.00

mm/hr

Total CS sunshine this month was

55.5

hrs

which is

114.4

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

hrs

which is

per  cent

of the 1971-2000 average

Highest daily sun was

6.3

hrs

on  the

20

Maximum  snow depth  was

24.0

cm

on  the

Mean sea-level pressure at 09Z

1006.8

mbar

which is

-7.8

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1033.6

mbar

on  the

11

Lowest  pressure at 09Z

985.9

mbar

on  the

22

Number of days with:

Air Frost

15

0.2mm rain

20

No  sun

10

Snow lying

12

Grnd Frost

20

1.0mm

15

3h  sun

9

Snow/sleet

14

Max < 0ºC

4

5mm

7

6h  sun

2

Hail

1

Max > 10

1

10mm

4

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

10

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: